Pneumatic action.



'Q @Qem af W. G. BETZ.

PNEUMATIC ACTION.

APPLICATION min MAY2o,1914.

1,174,807. Patented Mam, y1916.

' 'mmllllllllil ill n 'ml :OLUNIIIA Pumoallum co.. WASHINGTON, n. c.

vfeo

V WILLIAM G, nmz, oFvBUFFALolz-NEW vonk., i y

PNEMATIC ACTION.

Be it known that 1I, WILLIAM dentfof the citi7 of ufi'almcountyofErie,

and State of `New York, have invented cer-y tain new and usefulImprovementsinPneumatic Actions', of Which'tlie following' isa specification.

" forming a part fof thisfspecification,v and in; l v

v I 'fr-isteringy iwithtlieaport 16 and Said plate,

1 My invention relates to improvements in pneumatic actions especially j adaptedlfor use in 'piano plaver`s, andlias forjits c ibjectV f theprodiictionof a pneumaticlaction which will be oi' simple and economicalconstruction, *Y sensitive and quick-acting k,in operation, and'of high eiiiciency in'use.

Other *objects Zvvill appeark hereinafter. The invention consists in the combinations and arrangements of partsheeinafter de-ry yscribed and claimed. The invention will be best understood by .l

reference' to Lthe accoinpanvine; drawing which, v

and Fig. 2 isa v section'taken on substantially' line f-mof'Fig. 1.L l j 1 The preferred form lof construction as illustrated in the drawing comprises a main Y is installedin' agpiano,pextends' the entire Width of the instrument.y This 'chamberf is formed by an upper member "2,' a'V lowerl memberk 3, and sp'acinqfstrips 45 arranged attlie edgefpoitious ofithe.niembeisjZand f '3. VThis mainvacuumfchainberwhen the Aaction is in useyis connectedivith a suitable; 'suction` niechani'sm f,for constantly V -maintainin apartial vacuum in said chamny ber. as Will be readily understood by those skilledin thefait. i

)Formed in the member passagelafw,y the outer end of which isfadaptedftobe'coik.v

nected* bv'means of a, pipe 6 Aivithonepf the openings in the trackerbar ofthe instrument Ain which the mechanism' is -in stalled, fSaidpassage is'in constant coinmunication With thegvacuum chamber 11 bv means of` a restricted passage,. generally`- yknQWnas la vent,l The innerv end of the 1 passagiey terminates in a port v8 over `which Vis: arranged al flexible diaphragm' 9 of 'rubl ber'cloth, leather or other suitable material.

Thef'port 8, is enlarged in crosssectional area :with regard tofthespassage. Way 5,

\ but `iS quite shallow, having only sufficient)r ldescription proceeds.

a central section through al pneumatic action embodving'mv invention,

. i Specimen@Lffrsatnt-` 4intentadoMair. 7, 1916. 1 ppiication sied My2o,1914."seriaiuaseejzi depth to permit 'of properiplayeof the dia-` y phragmythereby renderingtlie device extremely sensitive, as will be obvious as. the

Cofperatingfwith thedi'aphragm .9 is a lever10, pivoted intermediate its v,extreini ties as atll between ears 12 formed integral `Withand depending fromone end ofaplate 13 secured, as"shoivn, to the-under side f of member 2. The fendiy of lever 10y coiperat- 1 king yWiththe kdiaphragm 9 is provided AWith a `felt pad -or cushion" l4f`which engages againstthe underside ot a o plate 15` are rranged at the under side of said diaphragm. ,Thearrangeinent yis lsuclmas will be seen,

thatv liexinfrof said diaphragm effects roscillation of ltlielevver 10.v The plate 13 is. i arranged overfaport.orchamber 16 from e '.Wliichleadsfa passagefl'in open communi# i rcation 'with .a pneumatic 18ivhich isf fixed tothe upper sideA of membei'v The 'plate y13 is provided with a ycentral opening regsurrounding said opening, is bent iipivardlv ksaid valve seatis a valveQOfwhich is carried v Vat thefupper-fe'nd of a stem 21, the lower end of said stem being threaded in the ad vjacente'nd of the lever 10.l .The arrangement is such,las Willbeseen that, when the diaphragmy 9 is in j'upivardly Hexed position, asshoW-nin' Fig. 1,'the valve QOLWill ,be atfits lower terminal of movement resting' uponrthevalveseat 19 soas to prevent' :communication between the chambe-r 1 and 'the passa'fefl? l'eading'fto kiineiirnatic :18. ,Arrange'dinthe member above thevalve 2 0 isa: port 22 which communicates with l tapassage 23eXtending longitudinally of member Q .Which isdn: opencominunication With theY outside; atmosphere. "The port V20 e vvissoposition'ed tha twhen the-valvegQO is f iny closing position, relative tov the valve f seat 19,*as iiistdescribedafcommunication *.Will' :be establish'edgbetiveen said port andVV they passage 17, or in .other Words. between `the pneumaticrlS-and the` ou'tside atmos .phere Upon relevation of the' valve 20,v causedbv downward flexing' lof. the diaphragm 9. ,said valve will be moved to close l I the port 22 and to open communication bej gaf" tweenchamber 1 and passage l7.-or in other words. b etweensaid chamberand: the pneui Y yThemovable side of theg'pneumatic l'Sis rcglnected 'by means of a rod24 and cop-fk f threading of the stem 21 inthelev'er V10` affords means for readily adjusting thelat` ter relative to said lever in order to secure proper ypositioning of the` valve 20 relativek to the seat 19 and the port 22. i

While Ihave illustrated and preferred form ofconstruction for carrying my invention, into effect, this is capable of variation and modification Without departing fromthe spirit ofy the inventi0n. I,v

therefore, do not Wish to be limited to the y"exact details of constructionset` forth` but desireto avail myself of such variations and modlications' as fallwithin the scopeof the appended claim.

Having described my inventionr fwhat I Copiesr of lthis patent may be obtained-for described-fthe g 4r`'In testimony whereof y l y i name'to this Specicationin the presence of matic in open communication vvvithf'said last mentioned passage a valveplate arrangedv about e said' ,open communication provldedk with a central perforation andhaving the edges of said perforationturned into ik'said; communlcatlon to` constitute a e valve seat;

ears'formed integrally with the sides o'said f l "plate andfproje'cting at yrightangles thereto ;l

a lever pivoted in said earsfand operatively connected at one end with said diaphragm; a valve stem on ythe other end of said lever projecting throughsaid valve; and a valve4 l substantially as described.

two subseribingwitnesses. y i

- `Witnessesf 1 l y i JOSHUA R.- IrI. Por'rs` j 4 n HELEN i LILLs.

ongsaid valve vvstem seating on said va1ve Ihave signed my y a vviLLIAixi G, BETZ. ij i 

